<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区域 -->
    <el-card>
      <el-alert
        title="消息提示的文案"
        type="info"
        show-icon
        center
      > </el-alert>

      <!-- 步骤条 -->
      <el-steps
        :active="active - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 实现step与tab联动效果共用一个active-->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          tab-position="left"
          v-model="active"
          :before-leave='beforeLeave'
          @tab-click="tabClicked"
        >
          <el-tab-pane
            label="基本信息"
            name="0"
          >
            <el-form-item
              label="商品名称"
              prop="goods_name"
            >
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item
              label="商品价格"
              prop="goods_price"
            >
              <el-input v-model="addForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item
              label="商品数量"
              prop="goods_number"
            >
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item
              label="商品重量"
              prop="goods_weight"
            >
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item
              label="商品分类"
              prop='goods_cat'
            >
              <el-cascader
                props.expandTrigger="hover"
                :options="cateList"
                :props="catProps"
                v-model="addForm.goods_cat"
                @change="handleChange"
              >
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品参数"
            name="1"
          >
            <!-- 渲染表单的Item项 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cb"
                  v-for="(cb, i) in item.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品属性"
            name="2"
          >
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品图片"
            name="3"
          >
            <!-- action 表示图片要上传到的后台API地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button
                size="small"
                type="primary"
              >点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane
            label="商品内容"
            name="4"
          >
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button
              type="primary"
              class="btnAdd"
              @click="add"
            >添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
  </div>
</template>
<script>
export default {
  data() {
    return {
      active: '0',
      //添加表单数据对象
      addForm: {
        goods_name: '',
        goods_price: '',
        goods_number: '',
        goods_weight: '',
        goods_cat: [],
        goods_introduce: '',
        pics: [],
        attrs: []
      },
      manyTableData: [],
      onlyTableData: [],
      //商品分类的数据
      cateList: [],
      //级联选择器的配置对象
      catProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedOptions2: [],
      //验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' },
          { min: 2, message: '长度在 2 个字符之上', trigger: 'blur' }
        ],
         goods_price: [
        { required: true, message: '商品价格不能为空', trigger: 'blur' },
        { type: 'number', message: '价格必须为数字值', trigger: 'blur' }
      ],
      goods_number: [
        { required: true, message: '商品数量不能为空', trigger: 'blur' },
        { type: 'number', message: '数量必须为数字值', trigger: 'blur' }
      ],
      goods_weight: [
        { required: true, message: '商品重量不能为空', trigger: 'blur' },
        { type: 'number', message: '重量必须为数字值', trigger: 'blur' }
        ],
        goods_cat: [
             { required: true, message: '商品分类不能为空', trigger: 'blur' },
        ]
      },
      // 上传图片的URL地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false
    }
  },
  created() {
      this.getCateList();
  },
  methods: {
      //获取商品分类
      async getCateList() {
          const {data: res} = await this.$http.get('categories');
          if(res.meta.status !== 200) {
              return this.$message.error(res.meta.msg);
          }
          this.cateList = res.data;
          //console.log(this.cateList)
      },
      //级联选择器发生改变触发事件
      handleChange() {

      },
      //控制切换转态
        //  newactive即将进入的标签页,oldactive即将离开的标签页 
      beforeLeave(newactive, oldactive) {
          if(oldactive == '0' && this.addForm.goods_cat.length !== 3) {
              this.$message.error("请选择商品分类")
              return false;
          }
          return true;
      },
     async tabClicked() {
      // console.log(this.activeIndex)
      // 证明访问的是动态参数面板
      if (this.active === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' }
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败！')
        }

        console.log(res.data)
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.active === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' }
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败！')
        }

        console.log(res.data)
        this.onlyTableData = res.data
      }
    },
     // 处理图片预览效果
    handlePreview(file) {
      //console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // console.log(file)
      // 1. 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2. 从 pics 数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3. 调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
      this.addForm.pics.splice(i, 1)
      //console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      //console.log(response)
      // 1. 拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path };
      // 2. 将图片信息对象，push 到pics数组中
      this.addForm.pics.push(picInfo)
      //console.log(this.addForm)
    },
    //添加商品
    add() {
         this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项！')
        }
        // 执行添加的业务逻辑
        // lodash   cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          };
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals };
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)

        // 发起请求添加商品
        // 商品的名称，必须是唯一的
        const { data: res } = await this.$http.post('goods', form)

        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败！')
        }

        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      });
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null;
    }
  }
}
</script>
<style lang="less" scoped>
.el-steps {
  margin-top: 10px;
  padding: 0 50px;
  font-size: 12px;
}
.el-tabs {
  margin-top: 30px;
}
.el-button {
  margin-top: 20px;
}
</style>
 